CN112615703A

CN112615703A - Information sending and receiving method, equipment and device

Info

Publication number: CN112615703A
Application number: CN202011354227.8A
Authority: CN
Inventors: 向铮铮; 赵德华; 李添泽; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-09-14
Filing date: 2018-09-14
Publication date: 2021-04-06
Anticipated expiration: 2038-09-14
Also published as: CN110912659B; BR112021004713A2; US20210203462A1; WO2020052380A1; CN112615703B; CN110912659A; EP3852297A1; JP7222076B2; JP2021536713A; EP3852297A4

Abstract

An information sending method, an information receiving method, equipment and a device are provided, wherein the information sending method comprises the following steps: the method comprises the steps that a first terminal device determines at least one of the number or the position of m DMRSs carried on a PSSCH according to first information, wherein m is a positive integer, the first information comprises at least one of subcarrier interval, duration of the PSSCH or channel coherence time, and the first terminal device sends the m DMRSs to a second terminal device. There is provided a scheme for configuring a DMRS in a psch of V2X in an NR system. And the reference channel coherence time can be selected when determining the DMRSs in the psch, for example, the time interval between two configured adjacent DMRSs can be smaller than or equal to the channel coherence time, so that the accuracy of channel estimation according to the DMRSs can be improved.

Description

Information sending and receiving method, equipment and device

The present application is a divisional patent application with application number 201811075068.0 entitled "a method, apparatus and device for sending and receiving information".

Technical Field

The present application relates to the field of communications technologies, and in particular, to an information sending method, an information receiving method, an information sending device, an information receiving device, and an information receiving device.

Background

Vehicle-to-outside (V2X) is a key technology of future Intelligent Transportation Systems (ITS), and includes vehicle-to-vehicle (V2V), vehicle-to-roadside infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) communication interaction. The V2X technology can be well adapted to different application scenes, a series of traffic information such as real-time road conditions, roads and pedestrians is obtained through communication, traffic safety is greatly improved, congestion is reduced, and traffic efficiency is improved, and meanwhile the V2X technology also provides a low-cost and easy-to-implement basic platform for automatic driving, intelligent traffic and car networking innovation.

In V2X, a physical sidelink shared channel (pscch) may be used for communication between terminal devices. In the Long Term Evolution (LTE) standard, DMRS (demodulation reference signal) configuration of the psch basically follows a Physical Uplink Shared Channel (PUSCH) DMRS configuration scheme, and the psch only differs in that the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the DMRS in one slot (slot) is increased from 2 to 4 in the PUSCH to cope with a high mobility scenario. Referring to fig. 1, the position of the DMRS in the psch and PUSCH in one slot in the LTE standard is shown in comparison, and the hatched box in fig. 1 represents the position of the DMRS.

And in the fifth generation mobile communication technology (the 5)^thgeneration, 5G) New Radio (NR) system, for the psch, a scheme for configuring a DMRS has not been provided.

Disclosure of Invention

The embodiment of the application provides an information sending and receiving method, equipment and a device, which are used for providing a DMRS configuration scheme in PSSCH of V2X in an NR system.

In a first aspect, an information sending method is provided, where the method includes: the method comprises the steps that a first terminal device determines at least one of the number or the position of m DMRSs carried on a PSSCH according to first information, wherein m is a positive integer, and the first information comprises at least one of subcarrier spacing, the duration of the PSSCH or channel coherence time; and the first terminal equipment transmits the m DMRSs to a second terminal equipment.

The method may be performed by a first communication device, which may be a terminal device or a communication device capable of supporting the terminal device to implement the functions required by the method, for example, the first communication device is the first terminal device, but may also be other communication devices, such as a system on a chip.

In the embodiment of the application, at least one of the number or the position of m DMRSs on the PSSCH can be determined according to at least one of the factors of subcarrier spacing, the duration of the PSSCH or channel coherence time, so that a scheme for configuring the DMRS in the PSSCH of V2X in the NR system is provided. And the reference channel coherence time may be selected when determining the DMRSs in the psch, for example, a time interval between two configured adjacent DMRSs may be smaller than or equal to the channel coherence time, so that accuracy of channel estimation according to the DMRSs may be improved.

In one possible design, the first information includes the subcarrier spacing, the duration of the psch, and the channel coherence time, and the first terminal device determines at least one of the number or the location of the m DMRSs carried on the psch according to the first information, including: the first terminal equipment determines the duration of a symbol occupied by the PSSCH according to the subcarrier interval; the first terminal equipment determines a time interval between two adjacent DMRSs in the m DMRSs according to the duration of the symbol and the channel coherence time; and the first terminal equipment determines at least one of the number or the position of the m DMRSs according to the duration of the PSSCH and the time interval.

The first terminal device or the second terminal device may directly calculate at least one of the number or the position of the m DMRSs according to the first information, which is more direct. In addition, the embodiment of the application also considers the channel coherence time, and the distribution interval of the DMRS in the time domain can be smaller than or equal to the channel coherence time, so that the time-varying channel can be estimated more accurately.

In one possible design, the determining, by the first terminal device, at least one of the number or the position of the m DMRSs carried on the psch according to the first information includes: and the first terminal equipment determines at least one information of the number or the position of the m DMRSs according to the first information and the corresponding relation between at least one of a preconfigured subcarrier interval, the duration of the PSSCH or the channel coherence time and the DMRS.

That is, the corresponding relationship between at least one of the subcarrier interval, the duration of the psch, or the channel coherence time and the DMRS is preconfigured, so that the first terminal device or the second terminal device only needs to know the first information, and can directly determine at least one of the number and the position of the m DMRSs according to the first information and the corresponding relationship, which is relatively simple and is helpful for simplifying the implementation of the terminal device.

In one possible design, the method further includes: and the first terminal equipment determines that the PSSCH and the PSCCH transmitted by the first terminal equipment are in a TDM mode or an FDM mode.

If the pattern between the psch and the psch transmitted by the terminal device is different, the positions of the m DMRSs may be different, so the first terminal device or the second terminal device may determine the pattern between the psch and the psch transmitted by the terminal device.

In one possible design, the PSCCH is transmitted in a TDM pattern with the PSCCH transmitted by the second terminal device, then: a first symbol of the PSSCH is not occupied by the AGC, and a first DMRS in a time domain of the m DMRSs occupies the first symbol of the PSSCH; or, a first symbol of the PSSCH is occupied by the AGC, and a first DMRS in the m DMRSs in the time domain occupies a second symbol of the PSSCH.

If the PSCCH transmitted by the PSCCH and the terminal device is in TDM mode, a pre-DMRS configuration scheme may be used to accelerate the decoding process and reduce the delay. That is, the first DMRS in the time domain of the m DMRSs may be placed at the forefront of the psch as much as possible, which helps to speed up the decoding process and reduce the transmission delay. However, according to the requirement, in the NR system, the first symbol of the psch may be configured as data or AGC, so that, if the first symbol of the psch is occupied by AGC, the first DMRS in the m DMRSs in the time domain occupies the second symbol of the psch, and if the first symbol of the psch is not occupied by AGC, the first DMRS in the m DMRSs in the time domain occupies the first symbol of the psch, so that the DMRSs are advanced as much as possible, and the existing distribution mode of AGC is also compatible.

In one possible design, the PSCCH transmitted by the PSCCH and the second terminal device is in an FDM mode, a first DMRS in the m DMRSs in the time domain occupies a symbol with a sequence number n of the PSCCH, a total duration of n symbols with sequence numbers 0 to n-1 of the PSCCH is less than or equal to the channel coherence time, and n is a positive integer.

Considering that the overhead of the DMRS may be relatively large due to the pre-DMRS configuration scheme, and if the PSCCH and PSCCH are in the FDM mode, the pre-DMRS configuration scheme described in the foregoing is continuously used, and the effect of accelerating the decoding process may no longer be achieved. If the PSSCH and the PSCCH are in an FDM mode, the first DMRS in the m DMRSs in the time domain occupies a symbol with the sequence number n of the PSSCH, and the total duration of the n symbols with the sequence number 0-n-1 of the PSSCH is less than or equal to the channel coherence time, so that the first DMRS in the m DMRSs in the time domain can cover the symbol with the sequence number 0-n-1 of the PSSCH, namely the whole PSSCH can be covered by the m DMRSs. And a DMRS preposition mode is not adopted, which is beneficial to saving the overhead of the DMRS to a certain extent.

In one possible design, a time interval between two adjacent ones of the m DMRSs on the psch is less than or equal to the channel coherence time.

The time interval between two adjacent DMRSs among the m DMRSs is made to be less than or equal to the channel coherence time, which may improve the accuracy of channel estimation according to the DMRSs.

In a second aspect, an information receiving method is provided, the method including: the second terminal equipment determines at least one of the number or the position of m DMRSs carried on the PSSCH according to first information, wherein m is a positive integer, and the first information comprises at least one of subcarrier interval, duration of the PSSCH or channel coherence time; the second terminal device receives the m DMRSs from the first terminal device.

The method may be performed by a second communication apparatus, which may be a terminal device or a communication apparatus capable of supporting the terminal device to implement the functions required by the method, for example, the second communication apparatus is a second terminal device, and may also be other communication apparatuses, such as a chip system.

In one possible design, the first information includes the subcarrier spacing, the duration of the psch, and the channel coherence time, and the second terminal device determines at least one of the number or the location of the m DMRSs carried on the psch according to the first information, including: the second terminal equipment determines the duration of a symbol occupied by the PSSCH according to the subcarrier interval; the second terminal equipment determines a time interval between two adjacent DMRSs in the m DMRSs according to the duration of the symbol and the channel coherence time; and the second terminal equipment determines at least one of the number or the position of the m DMRSs according to the duration of the PSSCH and the time interval.

In one possible design, the determining, by the second terminal device, at least one of the number or the position of the m DMRSs carried on the psch according to the first information includes: and the second terminal equipment determines at least one information of the number or the position of the m DMRSs according to the first information and the corresponding relation between at least one of a preconfigured subcarrier interval, the duration of the PSSCH or the channel coherence time and the DMRS.

In one possible design, the method further includes: and the second terminal equipment determines that the PSSCH and the PSCCH transmitted by the second terminal equipment are in a TDM mode or an FDM mode.

For technical effects brought by the second aspect or various possible designs of the second aspect, reference may be made to the related descriptions of the first aspect or various designs of the first aspect, which are not repeated herein.

In a third aspect, a first communication device is provided, for example, the first communication device described in the foregoing, for example, a first terminal equipment. The communication device has the function of realizing the first terminal equipment in the method design. The communication means for example comprise a processor and a transceiver coupled to each other, the transceiver for example being implemented as a communication interface, which here is understood to be a radio frequency transceiving component in the first terminal device, in particular,

a processor, configured to determine at least one of the number or position of m DMRSs carried on a psch according to first information, where m is a positive integer, and the first information includes at least one of a subcarrier spacing, a duration of the psch, or a channel coherence time;

a transceiver configured to transmit the m DMRSs to a second terminal device.

In one possible design, the first information includes the subcarrier spacing, a duration of the psch, and the channel coherence time, and the processor is configured to determine at least one of a number or a location of the m DMRSs carried on the psch from the first information by: determining the duration of a symbol occupied by the PSSCH according to the subcarrier interval; determining a time interval between two adjacent DMRSs of the m DMRSs according to the duration of the one symbol and the channel coherence time; and determining at least one of the number or the position of the m DMRSs according to the duration of the PSSCH and the time interval.

In one possible design, the processor is configured to determine at least one of the number or the location of the m DMRSs carried on the psch from the first information by: and determining at least one of the number or the position of the m DMRSs according to the first information and the corresponding relation between at least one of a preconfigured subcarrier interval, the duration of the PSSCH or the channel coherence time and the DMRS.

In one possible design, the processor is further configured to: the PSSCH and a physical sidelink control channel PSCCH transmitted by the terminal equipment are in a time division multiplexing TDM mode or a frequency division multiplexing FDM mode.

In one possible design, the PSCCH is transmitted in TDM pattern with the PSCCH transmitted by the terminal device, then: a first symbol of the PSSCH is not occupied by an Automatic Gain Control (AGC), and a first DMRS in a time domain of the m DMRSs occupies the first symbol of the PSSCH; or, a first symbol of the PSSCH is occupied by the AGC, and a first DMRS in the m DMRSs in the time domain occupies a second symbol of the PSSCH.

In one possible design, the PSCCH transmitted by the PSCCH and the terminal device is in an FDM mode, a first DMRS in a time domain of the m DMRSs occupies a symbol with a sequence number n of the PSCCH, a total duration of n symbols with sequence numbers 0 to n-1 of the PSCCH is less than or equal to the channel coherence time, and n is a positive integer.

For technical effects brought by the third aspect or various possible designs of the third aspect, reference may be made to the description of the first aspect or various designs of the first aspect, which is not repeated herein.

In a fourth aspect, a second communication device is provided, for example, the second communication device described in the foregoing, for example, a second terminal equipment. The communication device has the function of realizing the second terminal equipment in the method design. The communication means for example comprise a processor and a transceiver coupled to each other, the transceiver for example being implemented as a communication interface, which here is understood to be a radio frequency transceiving component in the second terminal device, in particular,

a transceiver for receiving the m DMRSs from a first terminal device.

In one possible design, the processor is further configured to: and determining that the PSSCH and a physical sidelink control channel PSCCH transmitted by the terminal equipment are in a Time Division Multiplexing (TDM) mode or a Frequency Division Multiplexing (FDM) mode.

In one possible design, if the PSCCH and the PSCCH transmitted by the terminal device are in a TDM pattern, then: a first symbol of the PSSCH is not occupied by the AGC, and a first DMRS in a time domain of the m DMRSs occupies the first symbol of the PSSCH; or, a first symbol of the PSSCH is occupied by the AGC, and a first DMRS in the m DMRSs in the time domain occupies a second symbol of the PSSCH.

With regard to the fourth aspect or the technical effects brought by various possible designs of the fourth aspect, reference may be made to the related descriptions of the second aspect or various designs of the second aspect, which are not repeated herein.

In a fifth aspect, a third communication device is provided, for example, the first communication device described in the foregoing, for example, the first terminal equipment. The communication device has the function of realizing the first terminal equipment in the method design. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In one possible design, the specific structure of the communication device may include a processing module and a transceiver module. The processing module and the transceiver module may perform the corresponding functions in the method provided in the first aspect or any one of the possible implementations of the first aspect.

In a sixth aspect, a fourth communication device is provided, for example, the second communication device described in the foregoing, for example, a terminal equipment. The communication device has the function of realizing the second terminal equipment in the method design. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In one possible design, the specific structure of the communication device may include a processing module and a transceiver module. The processing module and the transceiver module may perform the corresponding functions in the method provided by the second aspect or any one of the possible implementations of the second aspect.

In a seventh aspect, a fifth communication device is provided. The communication device may be the first communication device in the above method design, for example, the first terminal equipment, or a chip disposed in the first terminal equipment. The communication device includes: a memory for storing computer executable program code; and a processor coupled with the memory. Wherein the program code stored by the memory comprises instructions that, when executed by the processor, cause the fifth communication device to perform the method of the first aspect or any one of the possible implementations of the first aspect.

The fifth communication device may further include a communication interface, and if the fifth communication device is the first terminal device, the communication interface may be a transceiver in the first terminal device, for example, a radio frequency transceiver component in the first terminal device, or if the fifth communication device is a chip disposed in the first terminal device, the communication interface may be an input/output interface of the chip, for example, an input/output pin, and the like.

In an eighth aspect, a sixth communications apparatus is provided. The communication device may be the second communication device in the above method design, such as a terminal device, or a chip disposed in the second terminal device. The communication device includes: a memory for storing computer executable program code; and a processor coupled with the memory. Wherein the program code stored by the memory comprises instructions which, when executed by the processor, cause the sixth communication device to perform the method of the second aspect or any one of the possible embodiments of the second aspect.

The sixth communication device may further include a communication interface, and if the sixth communication device is a second terminal device, the communication interface may be a transceiver in the second terminal device, for example, a radio frequency transceiver component in the second terminal device, or if the sixth communication device is a chip disposed in the second terminal device, the communication interface may be an input/output interface of the chip, for example, an input/output pin, and the like.

A ninth aspect provides a first communication system, which may include the first communication apparatus of the third aspect, the third communication apparatus of the fifth aspect, or the fifth communication apparatus of the seventh aspect, and include the second communication apparatus of the fourth aspect, the fourth communication apparatus of the sixth aspect, or the sixth communication apparatus of the eighth aspect.

A tenth aspect provides a computer storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the first aspect.

In an eleventh aspect, there is provided a computer storage medium having instructions stored thereon, which when run on a computer, cause the computer to perform the method as set forth in the second aspect or any one of the possible designs of the second aspect.

In a twelfth aspect, there is provided a computer program product comprising instructions stored thereon, which when run on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the first aspect.

In a thirteenth aspect, there is provided a computer program product comprising instructions stored thereon, which when run on a computer, cause the computer to perform the method of the second aspect described above or any one of the possible designs of the second aspect.

The embodiment of the application provides a scheme for configuring DMRS in PSSCH of V2X in NR system. And the reference channel coherence time can be selected when the DMRS in the PSSCH is determined, so that the accuracy of channel estimation according to the DMRS can be improved.

Drawings

Fig. 1 is a schematic diagram of a scheme of configuring DMRSs of PUSCH and pscch in an LTE system;

fig. 2 is a schematic view of an application scenario according to an embodiment of the present application;

fig. 3 is a flowchart of an information sending and receiving method according to an embodiment of the present application;

fig. 4 is a schematic diagram of a configuration scheme of a preamble DMRS provided in an embodiment of the present application;

fig. 5 is another schematic diagram of a configuration scheme of a preamble DMRS provided in an embodiment of the present application;

fig. 6 is a schematic diagram illustrating a comparison between a pre-DMRS configuration scheme and a non-pre-DMRS configuration scheme provided in an embodiment of the present application;

fig. 7 is a schematic diagram of a scheme for flexibly configuring a DMRS according to an embodiment of the present application;

fig. 8 is a schematic diagram of a communication apparatus capable of implementing functions of a network device according to an embodiment of the present application;

fig. 9 is a schematic diagram of a communication apparatus capable of implementing functions of a terminal device according to an embodiment of the present application;

fig. 10A to 10B are two schematic diagrams of a communication device according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices with wireless connection capability or processing devices connected to wireless modems. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an Access Point (AP), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), a user equipment (user device), or the like. For example, mobile phones (or so-called "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included or vehicle-mounted mobile devices, smart wearable devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

2) Network devices, including, for example, Access Network (AN) devices, such as base stations (e.g., access points), may refer to devices in AN access network that communicate with wireless terminal devices over one or more cells over AN air interface. The network device may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (gNB) in a fifth generation mobile communication technology (5G) New Radio (NR) system, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud ran) system, which is not limited in the embodiments of the present application.

3) V2X, which is the key technology of future ITS, includes direct communication of V2V, V2I, V2P, and communication interaction of V2N. The V2X technology can be well adapted to different application scenes, a series of traffic information such as real-time road conditions, roads and pedestrians is obtained through communication, traffic safety is greatly improved, congestion is reduced, and traffic efficiency is improved, and meanwhile the V2X technology also provides a low-cost and easy-to-implement basic platform for automatic driving, intelligent traffic and car networking innovation. V2X is a communication technology designed specifically for high-speed mobile applications. According to the latest regulation, V2X direct communication needs to support the relative speed of 500km/h at the maximum under the 6GHz frequency band

4) Channel coherence time, available T_CBy representation, it is meant a statistical average of the time interval over which the channel impulse response remains constant, which is inversely proportional to the doppler spread, describing the time-varying nature of the frequency dispersion of the channel in the time domain. In general, we calculate the channel coherence time T using the following equation_C：

Wherein f is_dIs the maximum Doppler frequency, v is the maximum relative velocity between the transmitting end and the receiving end, f_cThe carrier frequency, c is the speed of light.

According to the above formula 1 and formula 2, it can be calculated that, at a carrier frequency of 6GHz, when the maximum relative speed between the transmitting end and the receiving end is 280km/h, the corresponding channel coherence time is 0.272ms, and when the maximum relative speed between the transmitting end and the receiving end is increased to 500km/h, the corresponding channel coherence time is reduced to 0.152 ms.

5) DMRS, which is a main reference signal for estimating channel characteristics, has a configuration structure and density directly affecting the estimation capability of a time-varying channel. In order to make a more accurate estimation on the time-varying channel, in the embodiment of the present application, the distribution interval of the DMRS in the time domain may be less than or equal to the channel coherence time.

6) Sub-carrier spacing (SCS), which is the spacing value between the center positions or peak positions of two subcarriers adjacent to each other in the frequency domain in the OFDM system. For example, 15KHz, 30KHz, 60KHz, 120KHz, 240KHz, 480KHz, etc. may be provided. For example, the different subcarrier spacings may be integer multiples of 2. It will be appreciated that other values may be devised. For example, the subcarrier spacing in the LTE system is 15KHz, and the subcarrier spacing in the NR system may be 15KHz, or 30KHz, or 60KHz, or 120KHz, etc.

With respect to subcarrier spacing, reference may be made to table 1 below:

TABLE 1

μ	Δf＝2μ·15[kHz]
		0	15
1	30
		2	60
3	120
		4	240

Where μ is used to indicate the subcarrier spacing, for example, when μ is 0, the subcarrier spacing is 15kHz, and when μ is 1, the subcarrier spacing is 30 kHz. The length of one time slot corresponding to different subcarrier spacings is different, the length of one time slot corresponding to a subcarrier spacing of 15kHz is 0.5ms, the length of one time slot corresponding to a subcarrier spacing of 60kHz is 0.125ms, and so on. Accordingly, the length of one symbol corresponding to different subcarrier intervals is different.

7) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present application. "at least one" is to be understood as meaning one or more, for example one, two or more. For example, including at least one means including one, two, or more, and does not limit which ones are included, for example, including at least one of A, B and C, then including may be A, B, C, A and B, A and C, B and C, or a and B and C. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

Unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first terminal device and the second terminal device, are only used for distinguishing different terminal devices, and are not used for limiting the functions, priorities, importance degrees, and the like of the two terminal devices.

First, technical features related to embodiments of the present application are described.

In V2X, the psch may be used for communication between terminal devices. Since the side-link (SL) used for V2X communication uses time-frequency resources of an uplink (up-link, UL), in an LTE system, DMRS configuration of the psch basically follows a DMRS configuration scheme of a PUSCH, except that, to cope with a high mobility scenario, the psch increases the number of OFDM symbols occupied by the DMRS in one slot from 2 to 4 in the PUSCH. Referring to fig. 1, the position of the DMRS in the psch and PUSCH in one slot in the LTE standard is shown in comparison, and the hatched box in fig. 1 represents the symbol where the DMRS is located. By increasing the distribution density of the DMRS in the time domain, V2X in the LTE system can well meet the demand of high-speed applications.

In the 5GNR system, however, no DMRS configuration scheme has been provided for the psch.

In view of this, the technical solutions of the embodiments of the present application are provided. In the embodiment of the application, at least one of the number or the position of m DMRSs on the PSSCH can be determined according to at least one of the factors of subcarrier spacing, the duration of the PSSCH or channel coherence time, so that a scheme for configuring the DMRS in the PSSCH of V2X in the NR system is provided.

The technical solution provided in the embodiment of the present application may be applied to a 5G NR system, or an LTE system, or may also be applied to a next generation mobile communication system or other similar communication systems, which is not limited specifically.

A network architecture applied in the embodiment of the present application is described below, please refer to fig. 2.

Fig. 2 includes a network device and two terminal devices, which are referred to as a first terminal device and a second terminal device, respectively, and both take a vehicle as an example, the two terminal devices are connected to one network device, and may also communicate with each other, for example, the two terminal devices may communicate through a PSSCH. Of course, the number of the terminal devices in fig. 2 is only an example, and in practical application, the network device may provide services for a plurality of terminal devices, and the plurality of terminal devices may also communicate with each other.

The network device in fig. 2 is, for example, an access network device, such as a base station. Wherein the access network equipment corresponds to different equipment on different systems, e.g. on the fourth generation mobile communication technology (the 4)^thgeneration, 4G) system may correspond to an eNB, and in a 5G system may correspond to an access network device in the 5G system, for example, a gNB.

The technical scheme provided by the embodiment of the application is described below with reference to the accompanying drawings.

An embodiment of the present application provides a method for sending and receiving information, please refer to fig. 3, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 2 as an example. In addition, the method may be performed by two communication apparatuses, for example, a first communication apparatus and a second communication apparatus, wherein the first communication apparatus may be a network device or a communication apparatus capable of supporting the network device to implement the functions required by the method, or the first communication apparatus may be a terminal device or a communication apparatus (e.g., a system-on-chip) capable of supporting the terminal device to implement the functions required by the method. The same is true for the second communication apparatus, which may be a network device or a communication apparatus capable of supporting the network device to implement the functions required by the method, or the second communication apparatus may be a terminal device or a communication apparatus (e.g., a system-on-chip) capable of supporting the terminal device to implement the functions required by the method. And the implementation manners of the first communication device and the second communication device are not limited, for example, the first communication device and the second communication device are both terminal devices, or the first communication device is a terminal device, and the second communication device is a communication device capable of supporting the terminal device to implement the functions required by the method, and so on.

For convenience of introduction, in the following, the method is taken as an example performed by a terminal device and a terminal device, that is, the first communication apparatus is a terminal device, and the second communication apparatus is also a terminal device. For convenience of distinction, the two terminal devices are referred to as a first terminal device and a second terminal device, respectively. Since the following is an example of applying the method to the network architecture shown in fig. 2, the first terminal device described below may be a first terminal device in the network architecture shown in fig. 2, and the second terminal device described below may be a second terminal device in the network architecture shown in fig. 2.

S31, the first terminal equipment determines at least one of the number or the position of m DMRSs carried on the PSSCH according to first information, wherein m is a positive integer, and the first information comprises at least one of subcarrier spacing, the duration of the PSSCH or channel coherence time.

The first terminal device determines at least one of the number and the position of the m DMRSs carried on the PSSCH according to the first information, for example, the first terminal device determines the number and the position of the m DMRSs carried on the PSSCH according to the first information, or the first terminal device determines the number and the position of the m DMRSs carried on the PSSCH according to the first information.

Since the NR system supports different subcarrier spacings, and the lengths of the OFDM symbols corresponding to different subcarrier spacings are different, in this embodiment, the first information may include the subcarrier spacings. In addition, the number of DMRSs to be determined is generally related to the duration of the psch, and therefore, the duration of the psch may also be included in the first information. The duration of the psch may also be referred to as a time length of the psch, or referred to as a time duration of the psch in a time domain, or referred to as a number of symbols occupied by the psch (for example, an OFDM symbol, for simplicity, a time domain symbol such as the OFDM symbol is hereinafter referred to as a symbol for short), or referred to as a number of symbols sustained by the psch, and the like, which is not particularly limited. In addition, in order to make a more accurate estimation on the time-varying channel, the distribution interval of the DMRS in the time domain should be less than or equal to the channel coherence time, and therefore the channel coherence time may also be included in the first information. However, in the embodiment of the present application, the content specifically included in the first information is not limited. For example, the first information includes at least one of a subcarrier spacing, a duration of the psch, or a channel coherence time, which may be understood as meaning, for example, that the first information includes the subcarrier spacing, the duration of the psch, and the channel coherence time, or the first information includes the subcarrier spacing and the duration of the psch, or the first information includes the duration of the psch and the channel coherence time, or the first information includes the subcarrier spacing, the duration of the psch, or the channel coherence time. In addition, the first information may include other information besides at least one of the subcarrier spacing, the duration of the psch, or the channel coherence time, as long as the information can be used to determine the number and/or the position of the DMRSs, and specific content included in the first information is not limited.

The first terminal equipment determines at least one of the number or the position of the m DMRSs carried on the PSSCH according to the first information, and different modes can be adopted.

As a first way for the first terminal device to determine at least one of the number or position of the m DMRSs carried on the psch according to the first information, the first terminal device may determine the duration of one symbol according to the subcarrier spacing. In order to make a more accurate estimation on the time-varying channel, in the embodiment of the present application, the distribution interval of the DMRS in the time domain may be smaller than or equal to the channel coherence time. Therefore, the first terminal device may determine a time interval between two adjacent DMRSs of the m DMRSs according to a duration of one time domain symbol and a channel coherence time, wherein the time interval between the two adjacent DMRSs of the m DMRSs is less than or equal to the channel coherence time. The first terminal device also determines at least one of the number or the position of the m DMRSs according to the duration of the PSSCH and the time interval between two adjacent ones of the m DMRSs. For example, the first terminal device may determine the value of m and determine the positions of m DMRSs in the psch according to the duration of the psch and the time interval between two adjacent DMRSs in the m DMRSs.

In the first way, the first terminal device calculates at least one of the number or position of the m DMRSs directly according to the first information. In order to simplify the implementation of the first terminal device, the embodiment of the present application further provides a second manner in which the first terminal device determines, according to the first information, at least one of the number or the position of the m DMRSs carried on the psch, and in the second manner, the first terminal device may determine, according to the first information and a correspondence between the DMRSs and at least one of a preconfigured subcarrier interval, a duration of the psch, or a channel coherence time, at least one of the number or the position of the m DMRSs. That is, the corresponding relationship between the DMRS and at least one of the subcarrier interval, the duration of the psch, or the channel coherence time is preconfigured, so that the first terminal device only needs to know the first information, and can directly determine at least one of the number and the position of the m DMRSs according to the first information and the corresponding relationship. The correspondence between at least one of the subcarrier interval, the duration of the psch, or the channel coherence time and the DMRS may be understood as a correspondence between at least one of the subcarrier interval, the duration of the psch, or the channel coherence time and at least one of the number or the position of the DMRS.

For example, the pre-configured is the correspondence between the subcarrier interval, the duration of the psch, and the channel coherence time and the number and position of DMRSs, and the first terminal device may determine the number and position of m DMRSs according to the subcarrier interval, the duration of the psch, and the channel coherence time, and the correspondence, or the first terminal device may determine the number and position of m DMRSs according to the subcarrier interval, the duration of the psch, and the correspondence; or, the pre-configured is the correspondence between the subcarrier spacing and the duration of the psch and the number and the position of the DMRSs, and the first terminal device may determine the number and the position of the m DMRSs according to the subcarrier spacing and the duration of the psch and the correspondence. Through the second mode, the operation process of the first terminal device can be effectively simplified, and the efficiency of determining at least one piece of information in the number or the position of the m DMRSs is improved. For example, the corresponding relationship is specified by a protocol, or is configured to the terminal device in advance by the network device, or is configured by the terminal device itself and then notified to other terminal devices, so the terminal device configured with the corresponding relationship may be the first terminal device, or may be other terminal devices. Please refer to table 2, which is an example of a corresponding relationship:

TABLE 2

Table 2 may be understood as a correspondence between the subcarrier spacing and the duration of the psch and the number and positions of DMRSs, but when the correspondence is set, since the position of the DMRS is determined, the channel coherence time is also used, and thus table 2 may also be understood as a correspondence between the subcarrier spacing, the duration of the psch, and the channel coherence time and the number and positions of DMRSs. In table 2, in the column of DMRS positions, 0 to 5 on the abscissa of the first row may be regarded as a pointer instead of the position or number of DMRSs, and numbers in the lower row, for example, 3, 6, 9, and the like, may be regarded as positions indicating symbols occupied by DMRSs, for example, 3, and indicate symbols with sequence numbers of 3. For example, the subcarrier spacing is 15kHz, and if the length of the pscch is 3 symbols, only one DMRS that occupies a symbol with a sequence number of 0 may be included in the DMRS position, and the DMRS may cover the entire pscch, that is, the number of m DMRSs is 1, that is, m is 1. Or, the subcarrier spacing is 15kHz, if the length of the psch is 6, it is not enough that only one DMRS occupying a symbol with sequence number 0 is included in the DMRS position because the time interval between the symbol in which the DMRS is located and the last symbol of the psch is already greater than the channel coherence time, and therefore one DMRS occupying a symbol with sequence number 3 is also included, that is, the number of m DMRSs is 2, that is, m is 2. Here, the sequence number of the symbol is, for example, a sequence number written from 0 to the symbol occupied by the psch in time domain order.

For a better understanding of table 2, please refer to fig. 4, which is an illustration of several cases in the correspondence relationship shown in table 2. In fig. 4, the boxes with diagonal lines indicate symbols occupied by DMRS, the boxes with horizontal lines indicate symbols not occupied by pscch, and the symbols indicated by the blank boxes and the symbols occupied by DMRS are symbols occupied by pscch. Taking a 15kHz subcarrier spacing as an example, when the duration of one symbol is 71.4us (in the case of using a standard Cyclic Prefix (CP)), if the channel coherence time is 0.152ms, the adjacent DMRSs among the m DMRSs should not be greater than 2 symbols to ensure that the time interval is less than the channel coherence time of 0.152ms, and the problem of reducing the number of the DMRSs as much as possible is also considered, so that in fig. 4, when the subcarrier spacing is 15kHz, the time interval between two adjacent DMRSs is 2 symbols, is not greater than 2 symbols, is less than the channel coherence time, and is not set to be 1 symbol, so that the DMRSs are not distributed too densely as much as possible, and the transmission efficiency of the pscch is improved. And as the duration length of the time slot in which the PSSCH is located increases, the number of the DMRSs needs to be correspondingly increased. For example, the subcarrier spacing is 15kHz, if the duration of the psch is 9 symbols, the number of DMRSs is 3, and a symbol with a sequence number of 0, a symbol with a sequence number of 3, and a symbol with a sequence number of 6, that is, a first symbol of the psch, a fourth symbol of the psch, and a seventh symbol of the psch, are occupied. Or, the subcarrier interval is 60kHz, if the duration of the psch is 8 symbols, the number of DMRSs is 1, and a symbol with a sequence number of 0, that is, the first symbol of the psch, is occupied, and if the duration of the psch is 14 symbols, the number of DMRSs is 2, and a symbol with a sequence number of 0 and a symbol with a sequence number of 8, that is, the first symbol of the psch and the ninth symbol of the psch, respectively, are occupied, and so on, which will not be described in detail.

Of course, if the first terminal device determines at least one of the number or position of the m DMRSs carried on the psch according to the first information without using the second manner but using the first manner as described above, the result of the determination may also be the same as the result in table 2 or fig. 4.

To determine the positions of the m DMRSs in the psch, a factor is involved, that is, the position of the first DMRS in the m DMRSs in the time domain is determined, and after the position of the first DMRS is determined, the positions of subsequent DMRSs may be determined in succession.

In the embodiment of the present application, in order to speed up the decoding process and reduce the time delay, a pre-DMRS configuration scheme may be used. That is, the first DMRS in the time domain of the m DMRSs may be placed at the forefront of the psch as much as possible, which helps to speed up the decoding process and reduce the transmission delay. However, according to the requirement, in the NR system, the first symbol of the psch may be configured as data or Automatic Gain Control (AGC), and in both cases, the pre-DMRS configuration schemes may be slightly different, and are described separately below.

1. The first symbol of the psch is occupied by data.

The first symbol of the psch is occupied by data, which can also be understood as the first symbol of the psch is not occupied by AGC. In this case, because the embodiment of the present application employs a pre-DMRS configuration, the first DMRS in the time domain of the m DMRSs may occupy the first symbol of the pscch, as exemplified in table 2 and fig. 4.

2. The first symbol of the psch is occupied by the AGC.

Since the first symbol of the psch is occupied by the AGC, the DMRS can obviously not occupy the first symbol of the psch any more, so the DMRS may be correspondingly shifted backwards, e.g., the first DMRS in the time domain among the m DMRSs may occupy the second symbol of the psch. Of course, if the second symbol of the pscch is also occupied by other signals than the DMRS, the DMRS may also be moved backwards, taking the example where the first DMRS in the time domain of the m DMRSs occupies the second symbol of the pscch.

If the first terminal device determines at least one of the number or the position of the m DMRSs carried on the psch according to the first information in the first manner as described above, the first terminal device may determine the position of the first DMRS in the time domain among the m DMRSs according to whether the first symbol of the psch is occupied by the AGC, and may directly determine at least one of the number or the position of the m DMRSs according to the first information. If the first terminal device determines at least one of the number or position of the m DMRSs carried on the psch from the first information in the second manner as described above, an example of a correspondence may refer to table 3 if the first DMRS in the time domain of the m DMRSs occupies the second symbol of the psch:

TABLE 3

Table 3 may be understood as a correspondence between the subcarrier spacing and the duration of the psch and the number and positions of DMRSs, but when the correspondence is set, since the position of the DMRS is determined, the channel coherence time is also used, and thus table 3 may also be understood as a correspondence between the subcarrier spacing, the duration of the psch, and the channel coherence time and the number and positions of DMRSs. In table 3, in the column of DMRS positions, 0 to 5 on the abscissa of the first row may be regarded as a pointer instead of the position or number of DMRSs, and numbers in the lower row, for example, 3, 6, 9, and the like, may be regarded as positions indicating symbols occupied by DMRSs, for example, 3, and indicate symbols with sequence numbers of 3. For example, the subcarrier spacing is 15kHz, and if the length of the pscch is 4 symbols, only one DMRS occupying a symbol with a sequence number of 1 may be included in the DMRS position, and the DMRS may cover the entire pscch, that is, the number of m DMRSs is 1, that is, m is 1. Or, the subcarrier spacing is 15kHz, if the length of the psch is 7, it is not enough that only one DMRS occupying a symbol with sequence number 1 is included in the DMRS position because the time interval between the symbol in which the DMRS is located and the last symbol of the psch is already greater than the channel coherence time, and therefore one DMRS occupying a symbol with sequence number 4 is also included, that is, the number of m DMRSs is 2, that is, m is 2. Here, the sequence number of the symbol is, for example, a sequence number written from 0 to the symbol occupied by the psch in time domain order.

For a better understanding of table 3, please refer to fig. 5, which is an illustration of several cases in the correspondence relationship shown in table 3. In fig. 5, the boxes with "/" indicate symbols occupied by DMRS, the boxes with "\" indicate symbols occupied by AGC, the boxes with horizontal lines indicate symbols not occupied by pscch, and the symbols indicated by the blank boxes and the symbols occupied by DMRS are the symbols occupied by pscch. Taking a 15kHz subcarrier spacing as an example, when the duration of one symbol is 71.4us (in the case of using a standard Cyclic Prefix (CP)), if the channel coherence time is 0.152ms, the adjacent DMRSs among the m DMRSs should not be greater than 2 symbols to ensure that the time interval is less than the channel coherence time of 0.152ms, and the problem of reducing the number of the DMRSs as much as possible is also considered, so that in fig. 5, when the subcarrier spacing is 15kHz, the time interval between two adjacent DMRSs is 2 symbols, is not greater than 2 symbols, is less than the channel coherence time, and is not set to be 1 symbol, so that the DMRSs are not distributed too densely as much as possible, and the transmission efficiency of the pscch is improved. And as the duration length of the time slot in which the PSSCH is located increases, the number of the DMRSs needs to be correspondingly increased. For example, the subcarrier spacing is 15kHz, if the duration of the psch is 10 symbols, the number of DMRSs is 3, and a symbol with a sequence number of 1, a symbol with a sequence number of 4, and a symbol with a sequence number of 7, that is, a second symbol of the psch, a fifth symbol of the psch, and an eighth symbol of the psch, are occupied, respectively. Or, the subcarrier interval is 60kHz, if the duration of the psch is 9 symbols, the number of DMRSs is 1, and a symbol with sequence number 1, that is, the second symbol of the psch, is occupied, and if the duration of the psch is 14 symbols, the number of DMRSs is 2, and a symbol with sequence number 1 and a symbol with sequence number 9, that is, the second symbol of the psch and the tenth symbol of the psch, respectively, are occupied, and so on, which will not be described in detail.

Of course, if the first terminal device determines at least one of the number or location of the m DMRSs carried on the psch according to the first information without using the second manner but using the first manner as described above, the result of the determination may also be the same as the result in table 3 or fig. 5.

In the embodiment of the present application, between the psch and a Physical Sidelink Control Channel (PSCCH) transmitted by the first terminal device, a time division multiplexing (TDM or TDMed) mode may be used, or a frequency division multiplexing (FDM or FDMed) mode may be used. If the TDM mode is between the PSCCH and PSCCH, the use of the preamble DMRS configuration scheme described above can help to speed up the decoding process and reduce the transmission delay. If there is an FDM mode between PSCCH and PSCCH, then continuing to use the preceding DMRS configuration scheme described above may no longer achieve the effect of speeding up the decoding process. In addition, in order to cope with a high-speed scenario, the advanced DMRS configuration scheme may require more DMRSs, and thus, overhead of the DMRSs may be increased. Then, the present embodiment provides another DMRS configuration scheme, which may be referred to as a non-preamble DMRS configuration scheme, or may be referred to as a scheme for flexibly configuring a DMRS, and may be understood as to enable the first DMRS in the time domain, which is carried in the pscch, not to be carried in the first symbol of the pscch. For example, referring to fig. 6, the first row in fig. 6 represents a preceding DMRS configuration scheme, and the second row in fig. 6 represents a non-preceding DMRS configuration scheme provided in this embodiment, it can be seen that the preceding DMRS configuration scheme requires more DMRS from the perspective of DMRS overhead under the condition of the same channel coherence time. Therefore, in consideration of the fact that the overhead of the DMRS may be relatively large due to the pre-DMRS configuration scheme, and if the PSCCH and PSCCH are in the FDM mode, the pre-DMRS configuration scheme described in the foregoing may be continuously used, and the effect of accelerating the decoding process may no longer be achieved. That is, the preamble DMRS configuration scheme described in the foregoing may be used in the case of a TDM mode between the PSCCH and PSCCH, and a scheme for flexibly configuring a DMRS in the case of an FDM mode between the PSCCH and PSCCH will be described below.

For the first terminal device, before determining at least one of the number or position of the m DMRSs, it may first determine whether the PSCCH transmitted with the first terminal device is in TDM mode or FDM mode, and if the PSCCH is in TDM mode, the first terminal device may determine to use the preamble DMRS configuration scheme described above, that is, if the first symbol of the PSCCH is occupied by AGC, the first terminal device determines that the first DMRS in the time domain of the m DMRSs occupies the second symbol of the PSCCH, and if the first symbol of the PSCCH is not occupied by AGC, the first terminal device determines that the first DMRS in the time domain of the m DMRSs occupies the first symbol of the PSCCH; alternatively, if the PSCCH transmitted with the first terminal device is in FDM mode, the first terminal device may determine to use the scheme of flexibly configuring DMRSs described below to determine the position of the first DMRS in the time domain of the m DMRSs. Or, the first terminal device may not perform the operation of determining whether the PSCCH and the PSCCH transmitted by the first terminal device are in the TDM mode or the FDM mode, for example, whether the PSCCH and the PSCCH transmitted by the first terminal device are in the TDM mode or the FDM mode is determined in advance, and the first terminal device is known, so that it is not necessary to determine again, and only needs to correspondingly adopt a pre-DMRS configuration scheme or a scheme for flexibly configuring the DMRS.

In the scheme for flexibly configuring the DMRSs, a manner in which the first terminal device determines at least one of the number and the position of the m DMRSs according to the first information may be the same as that described above, and may be determined according to the first manner or the second manner described above, where it is understood that, in this scheme, unlike the previous DMRS configuration scheme, a position of a symbol occupied by a first DMRS in a time domain in the m DMRSs is different. Under the scheme, the first DMRS in the m DMRSs in the time domain occupies a symbol with the sequence number n of the PSSCH, the total duration of the n symbols with the sequence number 0-n-1 of the PSSCH is less than or equal to the channel coherence time, and n is a positive integer. For example, the symbols occupied by the psch are coded with sequence numbers starting from 0 in time domain order, and then the symbol with sequence number n should be the n +1 th symbol in the psch. For example, if the symbol occupied by the psch is a sequence number written from 0, the symbol with sequence number 3 in the psch should be the fourth symbol in the psch. The value of n is, for example, specified by a protocol, configured by a network device to a terminal device, or configured by the terminal device, and notified to another terminal device, and if configured by the terminal device, the terminal device configured with the value of n may be the first terminal device, or may be another terminal device.

If the first terminal device determines at least one of the number and the position of the m DMRSs carried on the psch according to the first information in the first manner as described above, the first terminal device may determine the value of n, that is, determine the position of the first DMRS in the m DMRSs in the time domain, and may directly determine at least one of the number and the position of the m DMRSs according to the first information. If the first terminal device determines at least one of the number or position of m DMRSs carried on the psch from the first information in the second manner as described above, an example of a correspondence may refer to table 4 if the first DMRS in the time domain of the m DMRSs occupies a symbol with sequence number n of the psch:

TABLE 4

N in table 4 indicates the duration of the psch in the second column of table 4. In each calculation formula in the column of DMRS location, the value of n is calculated. Wherein the content of the first and second substances,

indicating that X is rounded up. For example, the duration of the pscch is 8 symbols, that is, N is 8, the DMRS occupies a symbol with a sequence number of 3 among symbols occupied by the pscch.

Table 4 may be understood as a correspondence between the subcarrier spacing and the duration of the psch and the number and positions of DMRSs, but when the correspondence is set, since the position of the DMRS is determined, the channel coherence time is also used, and thus table 4 may also be understood as a correspondence between the subcarrier spacing, the duration of the psch, and the channel coherence time and the number and positions of DMRSs. For the description related to table 4, reference may be made to the description related to table 2 or table 3, which is not repeated herein.

For a better understanding of table 4, please refer to fig. 7, which is an illustration of several cases in the correspondence shown in table 5. In fig. 7, the boxes with diagonal lines indicate symbols occupied by DMRS, the boxes with horizontal lines indicate symbols not occupied by pscch, and the symbols indicated by the blank boxes and the symbols occupied by DMRS are symbols occupied by pscch. Taking a 15kHz subcarrier spacing as an example, when the duration of one symbol is 71.4us (in the case of using a standard Cyclic Prefix (CP)), if the channel coherence time is 0.152ms, the adjacent DMRSs among the m DMRSs should not be greater than 2 symbols to ensure that the time interval is less than the channel coherence time of 0.152ms, and the problem of reducing the number of the DMRSs as much as possible is also considered, so that in fig. 7, when the subcarrier spacing is 15kHz, the time interval between two adjacent DMRSs is 2 symbols, is not greater than 2 symbols, is less than the channel coherence time, and is not set to be 1 symbol, so that the DMRSs are not distributed too densely as much as possible, and the transmission efficiency of the pscch is improved. And fig. 7 uses a scheme for flexibly configuring DMRSs, so that the first DMRS in the time domain of m DMRSs does not occupy the first time domain symbol in the psch, then, the channel coherence time is also considered, so that the first DMRS in the time domain of m DMRSs can cover the first time domain symbol in the psch, for this reason, the total duration of the n symbols with sequence numbers 0 to n-1 of the psch can be made less than or equal to the channel coherence time, continuing to take the example that the subcarrier spacing is 15kHz, in fig. 7, the first DMRS in the m DMRSs occupies the symbol with sequence number 2 in the psch, that is, the third symbol in the psch, and the total duration of the first symbol and the second symbol of the psch (that is, the symbol with sequence number 0 and the symbol with sequence number 1) is two symbols and is less than or equal to the channel coherence time. And as the duration length of the time slot in which the PSSCH is located increases, the number of the DMRSs also needs to be correspondingly increased. For example, the subcarrier spacing is 15kHz, if the duration of the psch is 11 symbols, the number of DMRSs is 3, and a symbol with a sequence number of 2, a symbol with a sequence number of 5, and a symbol with a sequence number of 8, that is, a third symbol of the psch, a sixth symbol of the psch, and a ninth symbol of the psch, are occupied. Or, the subcarrier spacing is 60kHz, if the duration of the psch is less than or equal to 14 symbols, the number of DMRSs is 1, and a symbol with a sequence number of 6, that is, a seventh symbol of the psch, is occupied.

Of course, if the first terminal device determines at least one of the number or position of the m DMRSs carried on the psch according to the first information without using the second manner but using the first manner as described above, the result of the determination may also be the same as the result in table 4 or fig. 7.

For example, fig. 7 may be compared with fig. 4 or fig. 5, and since a scheme for flexibly configuring the DMRSs is used, for example, when the duration of the pscch is {4,5,7,8,10,11,13,14}, compared with the preceding DMRS scheme, the overhead of one DMRS may be saved, which is beneficial to improving the transmission efficiency of the pscch.

S32, the second terminal equipment determines at least one of the number or the position of m DMRSs carried on the PSSCH according to first information, wherein m is a positive integer, and the first information comprises at least one of subcarrier spacing, the duration of the PSSCH or channel coherence time.

The second terminal device may first determine at least one of the number and the position of the m DMRSs carried on the psch according to the first information, to receive the psch.

For the second terminal device, before determining at least one of the number or position of the m DMRSs, it may be first determined whether the PSCCH transmitted by the PSCCH and the second terminal device is in a TDM mode or an FDM mode, and if the PSCCH is in the TDM mode, the second terminal device may determine to use the previous DMRS configuration scheme described above, that is, if the first symbol of the PSCCH is occupied by the AGC, the second terminal device determines that the first DMRS in the time domain of the m DMRSs occupies the second symbol of the PSCCH, and takes as an example to write sequence numbers of the symbols occupied by the PSCCH from 0 in the time domain order, the second symbol of the PSCCH is a symbol with a sequence number of 1, and if the first symbol of the PSCCH is not occupied by the AGC, the second terminal device determines that the first DMRS in the time domain of the m DMRSs occupies the first symbol of the PSCCH; alternatively, if the PSCCH transmitted with the second terminal device is in FDM mode, the second terminal device may determine to use the scheme of flexibly configuring DMRSs described below to determine the position of the first DMRS in the time domain of the m DMRSs. Or, the second terminal device may not perform the operation of determining whether the PSCCH transmitted by the PSCCH and the second terminal device is in the TDM mode or the FDM mode, for example, whether the PSCCH transmitted by the PSCCH and the second terminal device is in the TDM mode or the FDM mode is determined in advance, and the second terminal device is known, so that it is not necessary to determine again, and only needs to correspondingly adopt a pre-DMRS configuration scheme or a scheme for flexibly configuring the DMRS. The pscch transmitted by the first terminal device and the pscch transmitted by the second terminal device may refer to the same pscch in this embodiment.

The second terminal device may determine, in the same manner as the first terminal device, at least one of the number and the position of the m DMRSs carried on the psch according to the first information, which may specifically refer to the description in S31 and is not described in detail.

Wherein, S32 may be executed simultaneously with S31, or S31 is executed before S32, or S31 is executed after S32, which is not limited specifically.

And S33, the first terminal equipment sends the m DMRSs to the second terminal equipment, and then the second terminal equipment receives the m DMRSs from the first terminal equipment.

After determining at least one of the number and the position of the m DMRSs on the psch, the first terminal device may send the m DMRSs to the second terminal device, so that the second terminal device may receive the m DMRSs, and may perform operations such as channel estimation through the m DMRSs.

In the embodiment of the application, at least one of the number or the position of m DMRSs on the PSSCH can be determined according to at least one of the factors of subcarrier spacing, the duration of the PSSCH or channel coherence time, so that a scheme for configuring the DMRS in the PSSCH of V2X in the NR system is provided. The reference channel coherence time may be selected when determining the DMRSs in the psch, for example, a time interval between two configured adjacent DMRSs may be less than or equal to the channel coherence time, so that accuracy of channel estimation according to the DMRSs may be improved. Moreover, the embodiments of the present application provide schemes for configuring DMRS for the TDM mode and the FDM mode, so that the overhead of DMRS can be reduced as much as possible in the FDM mode, and the link transmission efficiency of PSSCH is improved.

The following describes an apparatus for implementing the above method in the embodiment of the present application with reference to the drawings. Therefore, the above contents can be used in the subsequent embodiments, and the repeated contents are not repeated.

Fig. 8 shows a schematic structural diagram of a communication device 800. The communication device 800 may implement the functionality of the first terminal device referred to above. The communication apparatus 800 may be the first terminal device described above, or may be a chip provided in the first terminal device described above. The communication device 800 may include a processor 801 and a transceiver 802. The processor 801 may be configured to execute S31 in the embodiment shown in fig. 3 and/or other processes for supporting the techniques described herein, such as all or part of the other processes except the transceiving processes performed by the first terminal device described in the foregoing. The transceiver 802 may be configured to perform S33 in the embodiment shown in fig. 3, and/or other processes for supporting the techniques described herein, such as all or part of the transceiving processes performed by the first terminal device described above.

For example, the processor 801 is configured to determine at least one of the number or the position of m DMRSs carried on a psch according to first information, where m is a positive integer, and the first information includes at least one of a subcarrier spacing, a duration of the psch, or a channel coherence time;

a transceiver 802 configured to transmit the m DMRSs to a second terminal device.

All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

Fig. 9 shows a schematic structural diagram of a communication device 900. The communication apparatus 900 may implement the functionality of the second terminal device referred to above. The communication apparatus 900 may be the second terminal device described above, or may be a chip provided in the second terminal device described above. The communication device 900 may include a processor 901 and a transceiver 902. The processor 901 may be configured to execute S32 in the embodiment shown in fig. 3, and/or other processes for supporting the technology described herein, for example, all or part of other processes except the transceiving processes executed by the second terminal device described in the foregoing may be executed. The transceiver 902 may be configured to perform S33 in the embodiment shown in fig. 3 and/or other processes for supporting the techniques described herein, such as all or part of the transceiving processes performed by the second terminal device described above.

For example, the processor 901 is configured to determine at least one of the number or the position of m DMRSs carried on a psch according to first information, where m is a positive integer, and the first information includes at least one of a subcarrier spacing, a duration of the psch, or a channel coherence time;

a transceiver 902 for receiving the m DMRSs from the first terminal device.

In a simple embodiment, one skilled in the art may also realize the communication apparatus 800 or the communication apparatus 900 by the structure of the communication apparatus 1000 as shown in fig. 10A. The communication apparatus 1000 may implement the functions of the terminal device or the network device referred to above. The communication device 1000 may include a processor 1001.

When the communication apparatus 1000 is used to implement the functions of the first terminal device mentioned above, the processor 1001 may be configured to execute S31 in the embodiment shown in fig. 3, and/or other processes for supporting the technology described herein, for example, all or part of other processes except the transceiving processes executed by the first terminal device described in the foregoing may be executed; alternatively, when the communication apparatus 1000 is used to implement the functions of the second terminal device mentioned above, the processor 1001 may be configured to execute S32 in the embodiment shown in fig. 3, and/or other processes for supporting the technology described herein, for example, all or part of the other processes except the transceiving processes executed by the second terminal device described in the foregoing may be executed.

The communication apparatus 1000 may be implemented by a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Micro Controller Unit (MCU), or a programmable controller (PLD) or other integrated chips, and the communication apparatus 1000 may be disposed in the first terminal device or the second terminal device of the embodiment of the present application, so that the first terminal device or the second terminal device implements the method provided by the embodiment of the present application.

In an alternative implementation, the communications apparatus 1000 may include a transceiver component for communicating with other devices. Where the communications apparatus 1000 is used to implement the functionality of the first terminal device or the second terminal device referred to above, the transceiving component may be used to perform S33 in the embodiment shown in fig. 3, and/or other processes to support the techniques described herein. For example, one of the transceiver components is a communication interface, if the communication apparatus 1000 is a first terminal device or a second terminal device, the communication interface may be a transceiver in the first terminal device or the second terminal device, such as the transceiver 802 or the transceiver 902, the transceiver may be a radio frequency transceiver component in the first terminal device or the second terminal device, or if the communication apparatus 1000 is a chip disposed in the first terminal device or the second terminal device, the communication interface may be an input/output interface of the chip, such as an input/output pin, and the like.

In an alternative implementation, the communications device 1000 may further include a memory 1002, as shown in fig. 10B, wherein the memory 1002 is used for storing computer programs or instructions, and the processor 1001 is used for decoding and executing the computer programs or instructions. It will be appreciated that these computer programs or instructions may comprise the functional programs of the first terminal device or the second terminal device described above. When the functional program of the first terminal device is decoded and executed by the processor 1001, the first terminal device can implement the function of the first terminal device in the method provided by the embodiment shown in fig. 3 in this application. When the functional program of the second terminal device is decoded and executed by the processor 1001, the second terminal device can implement the functions of the second terminal device in the method provided by the embodiment shown in fig. 3 in this application.

In another alternative implementation, the functional programs of these first terminal device or second terminal device are stored in a memory external to the communication apparatus 1000. When the functional program of the first terminal device is decoded and executed by the processor 1001, the memory 1002 temporarily stores a part or all of the contents of the functional program of the first terminal device. When the functional program of the second terminal device is decoded and executed by the processor 1001, the memory 1002 temporarily stores a part or all of the contents of the functional program of the second terminal device.

In another alternative implementation, the functional programs of these first terminal device or second terminal device are provided in a memory 1002 stored inside the communication apparatus 1000. When the memory 1002 inside the communication apparatus 1000 stores the function program of the first terminal device, the communication apparatus 1000 may be provided in the first terminal device of the embodiment of the present application. When the memory 1002 inside the communication apparatus 1000 stores the function program of the second terminal device, the communication apparatus 1000 may be provided in the second terminal device of the embodiment of the present application.

In yet another alternative implementation, part of the contents of the functional programs of these first terminal devices are stored in a memory external to the communication apparatus 1000, and the other part of the contents of the functional programs of these first terminal devices are stored in a memory 1002 internal to the communication apparatus 1000. Alternatively, part of the contents of the function programs of these second terminal devices are stored in a memory external to communication apparatus 1000, and the other part of the contents of the function programs of these second terminal devices are stored in memory 802 internal to communication apparatus 1000.

In the embodiment of the present application, the communication apparatus 800, the communication apparatus 900, and the communication apparatus 1000 may be presented in a form in which each function is divided into functional modules, or may be presented in a form in which each functional module is divided in an integrated manner. As used herein, a "module" may refer to an ASIC, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other components that provide the described functionality.

In addition, the embodiment shown in fig. 8 provides a communication apparatus 800 which can be implemented in other forms. The communication device comprises, for example, a processing module and a transceiver module. For example, the processing module may be implemented by the processor 801 and the transceiver module may be implemented by the transceiver 802. Among other things, the processing module may be used to perform S31 in the embodiment shown in fig. 3, and/or other processes for supporting the techniques described herein. The transceiver module may be used to perform S33 in the embodiment shown in fig. 3, and/or other processes for supporting the techniques described herein.

For example, the processing module is configured to determine at least one of the number or the position of m DMRSs carried on a psch according to first information, where m is a positive integer, and the first information includes at least one of a subcarrier interval, a duration of the psch, or a channel coherence time;

and the transceiver module is used for transmitting the m DMRSs to a second terminal device.

The embodiment shown in fig. 9 provides a communication apparatus 900 that can be implemented in other forms. The communication device comprises, for example, a processing module and a transceiver module. For example, the processing module may be implemented by the processor 901, and the transceiver module may be implemented by the transceiver 902. Among other things, the processing module may be used to perform S32 in the embodiment shown in fig. 3, and/or other processes for supporting the techniques described herein. The transceiver module may be used to perform S33 in the embodiment shown in fig. 3, and/or other processes for supporting the techniques described herein.

a transceiver module, configured to receive the m DMRSs from the first terminal device.

Since the communication apparatus 800, the communication apparatus 900 and the communication apparatus 1000 provided in the embodiment of the present application can be used to execute the method provided in the embodiment shown in fig. 3, the technical effects obtained by the method embodiments can refer to the above method embodiments, and are not described herein again.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Versatile Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. An information transmission method, comprising:

determining the number and the positions of m demodulation reference signals (DMRSs) borne on a physical side-row shared channel (PSSCH) according to the duration of the PSSCH, wherein m is a positive integer;

transmitting the m DMRSs to a second terminal device.

2. The method of claim 1, wherein the determining the number and the positions of m demodulation reference signals (DMRSs) carried on a Physical Sidelink Shared Channel (PSSCH) according to the duration of the PSSCH comprises:

and determining the number and the positions of the m DMRSs according to the duration of the PSSCH and the corresponding relation between the duration of the pre-configured PSSCH and the DMRS.

3. The method of claim 2,

the corresponding relation comprises:

when the duration of the PSSCH is 13 symbols, the number of the DMRSs is 3 and the symbols 1,6 and 11 are occupied; or

When the duration of the PSSCH is 9 symbols, the number of the DMRSs is 3 and the symbols 1,4 and 7 are occupied; or

When the duration of the PSSCH is 10 or 11 symbols, the number of the DMRSs is 4 and the symbols are 1,4,7 and 10.

4. The method of claim 1,

the first of the m DMRSs does not occupy a first symbol of the PSSCH.

5. The method according to claim 1 or 3,

the first one of the m DMRSs occupies a second symbol of the PSSCH.

6. The method of claim 1,

the first symbol of the PSSCH is used for automatic gain control.

7. An information receiving method, comprising:

receiving the m DMRSs from a first terminal device.

8. The method of claim 7, wherein the determining the number and the positions of m demodulation reference signals (DMRSs) carried on the PSSCH according to the duration of the PSSCH comprises:

9. The method of claim 8,

the corresponding relation comprises:

10. The method of claim 7,

the first of the m DMRSs does not occupy a first symbol of the PSSCH.

11. The method according to claim 7 or 9,

the first one of the m DMRSs occupies a second symbol of the PSSCH.

12. The method of claim 7,

the first symbol of the PSSCH is used for automatic gain control.

13. A first terminal device, comprising:

the device comprises a processing module, a receiving module and a processing module, wherein the processing module is used for determining the number and the positions of m demodulation reference signals (DMRSs) borne on a physical side-line shared channel (PSSCH) according to the duration of the PSSCH, and m is a positive integer;

14. The first terminal device of claim 13,

and the processing module is used for determining the number and the positions of the m DMRSs according to the duration of the PSSCH and the corresponding relation between the duration of the PSSCH and the DMRS, which is configured in advance.

15. The first terminal device of claim 14,

the corresponding relation comprises:

16. The first terminal device of claim 13,

the first of the m DMRSs does not occupy a first symbol of the PSSCH.

17. The first terminal device according to claim 13 or 15,

the first one of the m DMRSs occupies a second symbol of the PSSCH.

18. The first terminal device of claim 13,

the first symbol of the PSSCH is used for automatic gain control.

19. A second terminal apparatus, comprising:

a transceiver module configured to receive the m DMRSs from the first terminal device.

20. The second terminal device of claim 19,

21. The second terminal device of claim 20,

the corresponding relation comprises:

22. The second terminal device of claim 19,

the first of the m DMRSs does not occupy a first symbol of the PSSCH.

23. The second terminal device according to claim 19 or 21,

the first one of the m DMRSs occupies a second symbol of the PSSCH.

24. The second terminal device of claim 19,

the first symbol of the PSSCH is used for automatic gain control.

25. A communications device comprising a processor coupled to at least one memory, the processor configured to read a computer program stored in the at least one memory to perform the method of any of claims 1-6.

26. A communications device comprising a processor coupled to at least one memory, the processor configured to read a computer program stored in the at least one memory to perform the method of any one of claims 7-12.

27. A computer-readable storage medium, for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 6.

28. A computer-readable storage medium, for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 7 to 12.